On Tue, Apr 12, 2022 at 3:46 PM Fred Cisin via cctech
wrote:
> >> There's a 2K hole in the Model I memory map above the ROM
> On Tue, 12 Apr 2022, Yeechang Lee via cctech wrote:
> > Is this the hole that causes stock Model I to not run CP/M?
>
> NO.
> The problem with CP/M on TRS80 is that CP/M e
Good data, thanks! I kind of like the ESDI disks, they're more solid and
reliable than the MFM ones, and to be honest the RQDX3 was not a super
fast disk controller. I wonder if it could do block mode DMA.
I'll keep an eye out for the Sigma, the only thing I wish I had on the
MTI MQD13 would b
There's a 2K hole in the Model I memory map above the ROM
Is this the hole that causes stock Model I to not run CP/M?
NO.
The problem with CP/M on TRS80 is that CP/M expects RAM from location 0 on
up.
On Tue, 19 Apr 2022, Charles Dickman wrote:
When I was a freshman at Purdue, I lugged my M
An update on my fight with the PPR, also one of its cousins.
https://www.cnczone.com/forums/general-cnc-machine-related-electronics/430874-cnc-engineering.html#post2505622
covers my RFI to the CNC community and provides a few pictures of a 19" rack
reader integrated with a Zynq; load binary tape
It's not really fast enough and you'll get into all sorts of
complications once you start to think about trying to keep up with
simulation rotations. For example, if someone starts a read at half way
through a rotation (e.g. after the index pulse) now you have to have
logic/code that can start
Agree that we are talking about two vastly different projects.
Personally I think the universal disk reader is doable and interesting but
expensive.
Start with a clean bench having an air bearing variable speed motor and a
universal mount to which various pack/cartridge adapters can be mounted
At 01:40 PM 4/19/2022, Bjoren Davis via cctalk wrote:
>Looking at the photo I see the name "Dave Iacobone". I wonder if he is still
>around and remembers that board.
https://www.linkedin.com/in/dave-iacobone-0a11436/
At DEC from 1993 to 1996, now at iRobot.
- John
On with the saga of the COSMAC MS2000…
I powered it up a few days ago. The ROM boots, nothing smoked, the drives whirr.
However, one of the RAM boards (the lower 32k) seems to have failed with a
stuck bit. it outputs the rather humourous message of BAD RAM P00 (where P00 is
memory page 00h). po
Guy,
I understand that cylinder command has no particular timing requirements, while
head command must be effective within microseconds. My doubt is, RAM access on
high performance port could be fast enough to satisfy also the latter.
In case it couldn't or was not assured, I think the best strat
Hello Retronians,
I just saw some interesting DEC Professional items on eBay from
smhelectronics261 (https://www.ebay.com/sch/smhelectronics261/m.html):
1. Pro-350 (and presumably -325) video board
https://www.ebay.com/itm/294933607768
2. RD (hard disk) controller https://www.ebay.com/itm/2
I also have multiple ESDI controllers, more than one these flavors:
Dilog DQ686
http://www.bitsavers.org/pdf/dilog/2120-0137-1_DQ686_Nov89.pdf
Emulex QD21
http://www.bitsavers.org/pdf/emulex/QD2151002-J_QD21_Jun90.pdf
Sigma SCD-RQD11-EC (There seems to be multiple versions from different
vendors
Once upon a time I used an Emulex QD21, but I sold it because the actual
ESDI disks I had were a pain in the butt. Always crashing.
I still have a Webster (quad board) SRQD something.
I think I had a Dilog board also. It's been a while, probably 20 years.
Doug
On 4/18/2022 9:12 PM, Chris Zach
The problem is that you don't get the cylinder and head information in
the same command (they are 2 different commands). So when you're doing a
seek, you don't know which track(s) to prioritize. That is why during a
seek command I will transfer the entire cylinder so when the head
command arri
Wonder if there is a SPARC build. Guess it's too much to ask if it will
run on my Sun 386i's
C
On 4/19/2022 11:12 AM, Mike Katz via cctalk wrote:
I don't know if this has been posted already or not so I thought I would
show it here.
https://www.phoronix.com/scan.php?page=news_item&px=Or
I don't know if this has been posted already or not so I thought I would
show it here.
https://www.phoronix.com/scan.php?page=news_item&px=Oracle-Solaris-11.4-CBE
Hi ,
I am trying to contact Dennis Charles Komisky.
Cen anyone help me with his email address ?
Thanks !
Henk
> On Apr 18, 2022, at 6:44 PM, Mike Katz via cctalk
> wrote:
>
> Which is more generic.
>
> ESDI, SMD or SCSI.
>
> In my opinion, SCSI is as close are you are going to get to a universal
> interface.
>
> As for reading raw data from a drive. The newer the drive, the higher the
> bit den
On 2022-04-18 21:49, Chris Zach via cctalk wrote:
Anyone know of a source for the felt pads that go on the non-head side
of an RX50? Missing at least one here.
C
I successfully made replacements from self-adhesive felt punched out
using a leather punch like you would use to punch holes in
probably others out there that can use some of these cables too... sad
but true I wish I had bought up all the loose IMSAI parts Micro-age
redistribution had way back then in the early 1980s they had parts
and pieces of leftovers and half disassembled IMSAI atuff stu
Never had to replace them, but from what i remember, from cleaning out
an RX50 last year... they're thinner than cassette tape felt pads.
I imagine sticky back craft felt would be an adequate replacement.
Cutting it/stamping it out might be the tricky part.
https://www.bakerross.co.uk/se
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